Clare Island Survey — Fresh-water Algae. 16 55 



Sub-tribe Euchaetocereae. 

 Chaetoceros decipiens CI. — CB. 

 didymus (Ehrenb.) CI. — CB. 

 *paradoxvun CI. — CB. 

 *teres Cleve. — CB. 

 *Wighamii Brightw.— M; CB, 16-20 M broad. 



Tribe Melosireae. 

 Skeletonema costatum (Grev.) CI — CB, lO^u broad. 

 Melosira Borreri Grev. — AS; CB 41^ broad. 



f. MINOR f. nov.-Lat. 116^. CB. 

 nummuloides (Bory) Ag. — C, 33^ broad. 



var. hyperborea Grun. — C, 12-15^ broad, 

 sulcata (Ehrenb.) Kiitz.— AS, 24^ broad ; CB,23ju broad, also smaller forms 

 f. minor Richmond.— CNE. 

 *Druridgea geminata Donk.— C. 



*Hyalodiscus subtilis Bail. — CB, 17-18ju broad ; C, 21^ broad; AS, 23^ broad, 

 stelliger Bail. — CNE, 42-66^ broad, another gathering 36u broad. 

 Cyclotella striata (Kiitz.) Grun. — C; CB, 41,u broad ; AS; CNE, sometimes 

 not more than 20-22^ broad. 



Tribe Biddulphieae. 

 Biddulphia antediluviana (Ehrenb.) V. H. — C, breadth of valve- view 42^; 

 CB ; CNE, breadth of valve-view 43-52^. 

 *laevis Ehrenb. f. minor V. H.-C, CB, AS. 

 aurita (Lyngb.) Breb.-CB, 24-25/* long; AS, 25-26/1 long; CNE; 



C, 33/t long. 

 pulchella Gray. — CB, 87-90/1 long, breadth at middle 58/*. 

 Smithii (Ealfs) V. H.-C, 42/, broad ; CNE. 

 *Triceratium elegans Grev. f. pusilla V. H. — CB, 14 - o / u lat. 



Tribe Eupodisceae. 

 Auliscus soulptus (W. Sm.) Balfs. — CB, 52-5 x 48/,, valve-view. 

 Tribe Heliopelteae. 

 Actinoptychus undulatus Ehrenb. — CB, 46-70 broad; AS; CNE, 50-94/< 

 broad. 

 *splendens (Shadb.) Ralfs. — AS. 



Tribe Coscinodisceae. 

 Coscinodiscus perforatus Ehrenb. — C, 74-80^ broad. 



excentricus Ehrenb. — CNE. 

 Actinocyclus subtilis (Greg.) Ralfs. — CNE, 46-73/, broad. 



